Control Circuit Inspection

Check Short in control circuit
1. IG "OFF" & Disconnect HO2S (S2) connector.
2. IG "ON".
3. Measure the voltage between heater control terminal of HO2S (S2) harness connector and chassis ground.
  Specification: Approx. 3.5V
  
  Fig 1: Measuring Voltage Between Heater Control Terminal Of HO2S (S2) Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
  
  Fig 2: Identifying Oxygen Sensor (Down) Connector Terminals
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured voltage within specification?
  YES
  
  Go to "COMPONENT INSPECTION " procedure.
  
  NO
  
  Repair Short to ground in control circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.